Define the law of superposition
The law of superposition states that the oldest rocks in a stratigraphic sequence will be at the bottom, and age of each layer decreases as you move upwards (I.e. a layer in a sequence cannot be younger than one above it). This assumes that the sequence is still the right way up, and that none of the layers intruded after the sequence was deposited.
HH
Related Geology A Level answers
All answers ▸How can you tell the environment a sedimentary rock is deposited in?
Explain how Earthquakes Occur when Stress Stored in Rocks is Released.
What are the three broad classifications of rock type? How is each produced?
What is the difference between a syncline and an anticline?